import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

// 通过该servlet创建一个页面
@WebServlet("/index")
public class IndexServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // 1. 先获取到当前用户对应的会话对象，生成的页面需根据用户信息来构造
        HttpSession session = req.getSession(false);
        resp.setContentType("text/html; charset=utf8");
        if(session == null){
            resp.getWriter().write("尚未登录");
            return;
        }
        // 2. 从会话中拿到之前存储的用户信息
        String username = (String) session.getAttribute("username");
        Long loginTime = (Long) session.getAttribute("loginTime");
        // 3. 生成一个页面，把上述数据显示到页面上
        String respBody = "欢迎你" + username + "! 上次登录时间：" + loginTime;
        resp.getWriter().write(respBody);
    }
}
